Pole piece and application thereof, and low temperature rise safety lithium ion battery containing the pole piece

A pole piece, positive pole piece technology, applied in the field of low temperature rise safety lithium ion batteries, can solve the problems of inability to short circuit and reduce the probability of thermal runaway, achieve uniform internal temperature distribution, reduce charge and discharge temperature rise, temperature rise reduced effect

Active Publication Date: 2020-10-16
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the above-mentioned known technologies are adopted, the current technical level is still unable to reduce the probability of internal short circuit and thermal runaway to a negligible level.

Method used

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  • Pole piece and application thereof, and low temperature rise safety lithium ion battery containing the pole piece
  • Pole piece and application thereof, and low temperature rise safety lithium ion battery containing the pole piece
  • Pole piece and application thereof, and low temperature rise safety lithium ion battery containing the pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] like figure 1 As shown, the pole piece includes a first current collector 1, the upper surface and the lower surface of the first current collector 1 are provided with a first active coating 2, and the outer surface of the first active coating 2 is covered with a first high-efficiency conductive PTC film 3 The surface of the first high-efficiency conductive PTC film 3 away from the first current collector 1 is provided with a second active coating 4, and the ends of the first high-efficiency conductive PTC film 3 are bonded and fixed to the current collector. The pole piece is a positive pole piece. The first current collector 1 is an aluminum foil current collector.

[0058] 1) Production of the positive electrode composite coating pole piece (that is, the positive pole piece):

[0059] a. Pour positive active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 96:1:1:2, Mix and stir...

Embodiment 2

[0076] like figure 2 As shown, the pole piece of this embodiment is also a positive pole piece, and the structure of the positive pole piece is basically the same as that of Example 1, except that the outer surface of the second active coating 4 is covered with a second high-efficiency conductive PTC film 5, A third active coating 6 is provided on the surface of the second high-efficiency conductive PTC film 5 away from the first current collector 1 , and the ends of the second high-efficiency conductive PTC film 5 are also bonded and fixed to the first current collector 1 .

[0077] 1) Fabrication of the positive electrode composite coating pole piece (that is, the positive pole piece) (this embodiment emphasizes the situation of reducing the content of the conductive agent):

[0078] a. Pour positive active material NCM622, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 96:1:1:2, Mix and stir evenly to...

Embodiment 3

[0139] like image 3 As shown, the pole piece of this embodiment is also a positive pole piece, and the mechanism of the positive pole piece is basically the same as that of Example 2, except that the outer surface of the third active coating 6 is covered with a third highly efficient conductive PTC film 7, The third high-efficiency conductive PTC film 7 is provided with a fourth active coating 8 on the side away from the first current collector 1 , and the ends of the third high-efficiency conductive PTC film 7 are also bonded and fixed to the first current collector 1 .

[0140] 1) Production of the positive electrode composite coating pole piece (that is, the positive pole piece):

[0141] a. Pour positive active material NCM811, conductive agent 1 (SP), conductive agent 2 (CNTs), and binder (PVDF) into N-methyl-2-pyrrolidone in a weight ratio of 96.9:0.8:0.8:1.5, Mix and stir evenly to prepare positive electrode slurry A with a solid content of 75%;

[0142]b. Pour posit...

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Abstract

The invention provides a pole piece and an application thereof, and a low temperature rise safety lithium ion battery containing the pole piece, the pole piece comprises a current collector, and at least two active coatings and at least one efficient conductive PTC film are fixedly arranged on each of two opposite surfaces of the current collector; the active coating and the efficient conductive PTC film are arranged at intervals from inside to outside from the surface of the current collector, and the outermost side is the active coating; the conductivity of the active coating on the outermost layer is smaller than that of the other active coatings, and/or the active substance of the active coating on the outermost layer adopts an active substance with high thermal stability. According tothe pole piece disclosed by the invention, the internal temperature distribution is more uniform, the temperature rise of conventional use or internal short circuit of the battery is reduced, and thermal runaway can be slowed down, so that the safety of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a pole piece and its application, and a low-temperature rising safe lithium-ion battery containing the pole piece. Background technique [0002] With the continuous advancement of science and technology, lithium-ion batteries are gradually applied to many fields, from portable electronic products to electric vehicles, energy storage power supplies, aviation fields, etc. But lithium-ion batteries also have safety risks that cannot be ignored. According to reports, there have been many accidents of mobile phones burning and exploding due to bad lithium-ion batteries, involving well-known companies such as Samsung and Apple, and some incidents have led to product recalls; Well-known electric car companies such as BYD, NIO, and Tesla. The primary and most serious safety risk faced by Li-ion batteries is thermal runaway. The trigger and spread of thermal runaway are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/505H01M4/58H01M4/62H01M10/0525H01M10/0585H01M10/0587H01M10/42H01M10/613H01M10/617H01M10/653H01M10/654
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/625H01M4/5825H01M4/505H01M10/4235H01M10/0525H01M10/0585H01M10/0587H01M10/613H01M10/617H01M10/653H01M10/654H01M2004/028H01M2220/20H01M2220/30Y02E60/10Y02P70/50
Inventor 郑彦俊暴旭马华何伟从长杰王驰伟
Owner TIANJIN ENERGIES
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